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                        <blockquote>
<p><a href="https://github.com/rust-random/book/blob/master/src/update-0.6.md">update-0.6.md</a><br />
commit: 1552084912cc773ba6e528d216b0a351fe0468b4 <br />
本章译文最后维护日期：2020-12-1</p>
</blockquote>
<h1><a class="header" href="#updating-to-06" id="updating-to-06">Updating to 0.6</a></h1>
<h1><a class="header" href="#升级至06版" id="升级至06版">升级至0.6版</a></h1>
<p>在0.6版的发行周期中，Rand 在 <a href="https://github.com/rust-random">rust-random</a>项目下找到了一个新家。我们现在已经有宾至如归的感觉了，但是如果你愿意帮我们装饰，那贡献一个<a href="https://github.com/rust-random/rand/issues/278">新logo</a>我们将不胜感激！</p>
<p>我们还为以用户为中心的文档找到了一个新的家——这本书！</p>
<h2><a class="header" href="#prngs" id="prngs">PRNGs</a></h2>
<h2><a class="header" href="#伪随机数生成器" id="伪随机数生成器">伪随机数生成器</a></h2>
<p>我们<a href="https://docs.rs/rand/0.5/rand/prng/index.html">旧的PRNG模块</a>中的所有PRNG都被移到了新的 crate 中了。我们还添加了一个带有PCG算法的额外 crate，以及一个带有 Xoshiro/Xoroshiro算法的外部crate：</p>
<ul>
<li><a href="https://crates.io/crates/rand_chacha"><code>rand_chacha</code></a></li>
<li><a href="https://crates.io/crates/rand_hc"><code>rand_hc</code></a></li>
<li><a href="https://crates.io/crates/rand_isaac"><code>rand_isaac</code></a></li>
<li><a href="https://crates.io/crates/rand_xorshift"><code>rand_xorshift</code></a></li>
<li><a href="https://crates.io/crates/rand_pcg"><code>rand_pcg</code></a></li>
<li><a href="https://crates.io/crates/xoshiro"><code>xoshiro</code></a></li>
</ul>
<h3><a class="header" href="#smallrng" id="smallrng">SmallRng</a></h3>
<p>本次更新，我们将 <a href="https://rust-random.github.io/rand/rand/rngs/struct.SmallRng.html"><code>SmallRng</code></a> 后面的算法从 Xorshift 切换到PCG算法（要么是 <a href="https://rust-random.github.io/rand/rand_pcg/type.Pcg64Mcg.html"><code>Pcg64Mcg</code></a> (也就是 XSL 128/64 MCG)，或者 <a href="https://rust-random.github.io/rand/rand_pcg/type.Pcg32.html"><code>Pcg32</code></a> (也就是 XSH RR 64/32 LCG，也就是标准PCG算法)）。</p>
<h2><a class="header" href="#sequences" id="sequences">Sequences</a></h2>
<h2><a class="header" href="#序列" id="序列">序列</a></h2>
<p><a href="https://rust-random.github.io/rand/rand/seq/index.html"><code>seq</code>模块</a>已经被完全重写了，并且 <code>choose</code>方法和 <code>shuffle</code>方法已从 <a href="../rand/trait.Rng.html"><code>Rng</code></a> trait中删除。大多数函数现在可以在 <a href="https://rust-random.github.io/rand/rand/seq/trait.IteratorRandom.html"><code>IteratorRandom</code></a> trait 和 <a href="https://rust-random.github.io/rand/rand/seq/trait.SliceRandom.html"><code>SliceRandom</code></a> trait 中找到。</p>
<h3><a class="header" href="#weighted-choices" id="weighted-choices">Weighted choices</a></h3>
<h3><a class="header" href="#加权选择" id="加权选择">加权选择</a></h3>
<p><a href="https://docs.rs/rand/0.5/rand/distributions/struct.WeightedChoice.html"><code>WeightedChoice</code></a>分布现在已被替换为 <a href="https://rust-random.github.io/rand/rand/distributions/struct.WeightedIndex.html"><code>WeightedIndex</code></a>，通过改进函数的通用性，解决了几个问题。<!-- tobocheck --></p>
<p>为了方便起见，<a href="https://rust-random.github.io/rand/rand/seq/trait.SliceRandom.html#tymethod.choose_weighted"><code>SliceRandom::choose_weighted</code></a>方法（和其 <code>_mut</code>变体）允许将 <a href="https://rust-random.github.io/rand/rand/distributions/struct.WeightedIndex.html"><code>WeightedIndex</code></a>抽样直接应用于切片。<!-- tobocheck --></p>
<h2><a class="header" href="#other-features" id="other-features">Other features</a></h2>
<h2><a class="header" href="#其他特性" id="其他特性">其他特性</a></h2>
<h3><a class="header" href="#simd-types" id="simd-types">SIMD types</a></h3>
<p>Rand 现在有了生成SIMD类型的基本支持，此功能通过 <code>simd_support</code>特性标志位来开启</p>
<h3><a class="header" href="#i128--u128-types" id="i128--u128-types"><code>i128</code> / <code>u128</code> types</a></h3>
<p>由于这些类型现在可以在稳定的编译器上使用了，所以这些类型是自动支持的（需要足够新 Rust版本）。为向前兼容 <code>i128_support</code>特性标志位仍然存在，但不再起任何作用。</p>

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